Depends.
If I purchased the series as they were published, I'd re-read the earlier volumes before starting the new one to refresh my mind on the story arc.
If it's a completed series, then I usually get the lot and read at least the first book. Some I will leave it at that and not worry because I have got the complete series for the price of a single volume. Others I'll read some more into the series, and not be in any hurry to complete it, and others I'll finish the lot.
These days I'm usually picking up titles at 99p in various Kindle Deals (usually the monthly deal), and I am prepared to wait until I have the series completed before starting it.
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